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This change is necessary to support the [CSS Highlight API](https://drafts.csswg.org/css-highlight-api-1/), which uses `Selection` internally. To replace `nsRange` with `AbstractRange`, some sections needed to be adapted since `nsRange`-specific features were used. Therefore, some methods (such as `GetRangeAt()`) may only be called if the `Selection` is *not* of type `SelectionType::eHighlight`, as it (per spec) returns an `nsRange`. These methods will now `MOZ_ASSERT` if called for a highlight selection. Additional methods are implemented which return `AbstractRange` instead and are safe to be called for every selection type. This commit also improves support of highlight features: - Invalidation of highlight ranges: adding/removing Ranges in-place instead of removing and re-adding the Selection object associated with the highlight. - Ranges are only associated with the Selection that shares the same Document - Fixed minor IDL issue Differential Revision: https://phabricator.services.mozilla.com/D170582 |
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